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CN-122010504-A - Quick-curing repairing paste and preparation method thereof

CN122010504ACN 122010504 ACN122010504 ACN 122010504ACN-122010504-A

Abstract

The application provides a quick-curing repairing paste and a preparation method thereof, wherein the quick-curing repairing paste comprises the following raw materials, by mass, 50 parts of Portland cement, 40-60 parts of styrene-acrylic emulsion, 5-10 parts of modified slag, 0.4-1 part of hollow microspheres, 0.5-1.5 parts of glass fibers, 100-150 parts of quartz sand, 0.1-0.3 part of a dispersing suspending agent, 0.1-1 part of a defoaming agent and 20-40 parts of water, and the modified slag is of a core-shell structure and sequentially comprises a slag core, a calcium salt component loaded on the surface of the slag core or in pores, a humate layer formed by surface loading, and a quaternary ammonium salt type cationic polymer layer coated on the outer side of the humate layer. The repairing adhesive has the characteristics of short initial setting time, high early strength, good construction rheological property and the like, and is suitable for the fields of building gap repairing, pavement maintenance, concrete structure repairing and the like.

Inventors

  • WU RUI
  • ZHU BINGHAI
  • GUO RUILONG

Assignees

  • 湖北普耐新型建材有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The quick-curing repairing paste is characterized by comprising the following raw materials in parts by mass: 50 parts of Portland cement, 40-60 parts of styrene-acrylic emulsion, 5-10 parts of modified slag, 0.4-1 part of hollow microspheres, 0.5-1.5 parts of glass fiber, 100-150 parts of quartz sand, 0.1-0.3 part of dispersing suspending agent, 0.1-1 part of defoaming agent and 20-40 parts of water; The modified slag is of a core-shell structure and sequentially comprises a slag inner core, a calcium salt component loaded on the surface or in pores of the slag inner core, a humate layer formed by surface loading, and a quaternary ammonium salt type cationic polymer layer coated on the outer side of the humate layer.
  2. 2. The repair paste as claimed in claim 1, wherein the modified slag is prepared by: s1, dispersing slag and citric acid in water to enable carboxylic acid groups in citric acid molecules to coordinate with metal hydroxyl sites on the surface of the slag, so as to obtain citric acid modified slag; S2, dispersing citric acid modified slag and calcium salt in water to enrich calcium ions at an interface on the slag surface, so as to obtain slag loaded with calcium salt components; S3, dispersing slag and humate loaded with calcium salt components in water to fix the humate on the slag surface, so as to obtain slag forming a humate layer; and S4, dispersing slag forming the humate layer and quaternary ammonium salt type cationic polymers in water to enable the quaternary ammonium salt type cationic polymers to be electrostatically associated on the surface of the slag forming the humate layer, so as to obtain modified slag.
  3. 3. The repair paste as claimed in claim 2, wherein the step S1 comprises: 100 parts of slag, 1.5-3 parts of citric acid and 15-50 parts of water are mixed, and the mixture is treated for 1-5 hours at 20-60 ℃ to obtain the citric acid modified slag.
  4. 4. The repair paste as claimed in claim 2, wherein the step S2 comprises: Dispersing 100 parts of citric acid modified slag and 3-5 parts of calcium salt in 80-150 parts of water, and treating for 1-3 hours at 10-40 ℃ to obtain slag loaded with calcium salt components.
  5. 5. The repair paste as claimed in claim 2, wherein the step S3 comprises: Dispersing 100 parts of slag loaded with calcium salt and 2-4 parts of humate in 80-150 parts of water, adjusting the pH to 5-6, and performing rotary evaporation at 50-70 ℃ and-0.07 to-0.09 MPa after reacting for 30-90 min to obtain slag forming a humate layer.
  6. 6. The repair paste as claimed in claim 2, wherein the step S4 comprises: Dispersing 100 parts of slag forming a humate layer and 2-6 parts of quaternary ammonium salt type cationic polymer in 80-150 parts of water, and treating for 1-4 hours at 20-60 ℃ to obtain modified slag; the quaternary ammonium salt type cationic polymer comprises polydimethyl diallyl ammonium chloride.
  7. 7. The repair paste of claim 1, wherein the cenospheres have a particle size of 20 to 100 μm and a true density of 0.4 to 0.7g/cm 3 .
  8. 8. The repair paste of claim 1, wherein the glass fibers have a diameter of 1-15 μm and a length of 1-5 mm.
  9. 9. The repair paste of claim 1, wherein the quartz sand has a particle size of 80-500 μm.
  10. 10. A method of preparing a rapid cure repair paste comprising: Providing the raw materials included in the repair paste according to any one of claims 1 to 9; Blending the raw materials to obtain the quick-curing repairing paste.

Description

Quick-curing repairing paste and preparation method thereof Technical Field The application relates to the field of building materials, in particular to a quick-curing repairing paste and a preparation method thereof. Background In the construction and service process of building walls, concrete members and assembled structures, different forms of cracks and gaps are often generated due to shrinkage deformation, temperature and humidity changes and external force action. To restore structural integrity and to prevent intrusion of moisture and hazardous media, it is often necessary to use a repair material for filling and repair. The traditional gap repairing material mainly uses silicate cement, the material mainly depends on the hydration forming strength of cement, and has the advantages of low cost, good compatibility with concrete base materials, and the like, but has poor fluidity and workability, easy bleeding segregation, large hardening shrinkage, limited early crack resistance and interface bonding performance, and difficult satisfaction of the rapid repairing requirement of fine cracks and complex interfaces. In order to solve the above problems, cement-based polymer modified repair materials have been developed in the prior art, in which polymer emulsions (such as styrene-acrylic emulsion, EVA emulsion, polyurethane emulsion, etc.) are introduced into cement systems to form cement-polymer composite systems. The polymer emulsion has good film forming property, cohesiveness and flexibility, and can improve the crack resistance, interfacial adhesion and construction smoothness of the material, so that the material is easier to fill micro cracks and form effective combination with a base material. For example, patent CN121377668a discloses a polymer emulsion modified mortar, which improves flexibility, crack resistance and energy consumption performance of the mortar by increasing the blending amount of polymer emulsion. The technical proposal forms a continuous phase in a cement matrix through the polymer, thereby improving the later mechanical property and the shock resistance of the material and having certain application value in building repair and protection engineering. However, the modification thought of the technical scheme is mainly focused on improving the later toughness and mechanical properties, and the interaction relation between a cement hydration system and a higher-content emulsion system is lack of effective regulation. When the dosage of the polymer emulsion is increased, the cement system and the emulsion system are easy to interfere with each other in the early stage, the stable dispersion and film forming behavior of the emulsion can be influenced in the cement hydration process, and the existence of the emulsion can also produce certain obstruction to the cement hydration process, so that the two curing mechanisms are difficult to cooperatively process, thus the problems of slow early curing, lag in strength formation, prolonged drying time and the like of the material are presented, and the requirements of a crack repairing scene on 'quick curing, quick strength formation and quick application' are difficult to meet. The problem is particularly prominent in the repair material with higher polymer emulsion mixing amount, and is also a technical difficulty that the existing polymer modified cement-based repair material is ubiquitous but not effectively solved. Therefore, how to obtain a crack repairing material with rapid curing performance under the condition of keeping the content of a higher polymer emulsion is a key technical problem to be solved in the field. Disclosure of Invention The application provides a quick-curing repairing paste and a preparation method thereof, and aims to solve the problems of slow early curing and delayed formation of strength of a high-doping polymer emulsion modified cement repairing material in the prior art. In a first aspect, the application provides a quick-curing repair paste, which comprises the following raw materials in parts by mass: 50 parts of Portland cement, 40-60 parts of styrene-acrylic emulsion, 5-10 parts of modified slag, 0.4-1 part of hollow microspheres, 0.5-1.5 parts of glass fiber, 100-150 parts of quartz sand, 0.1-0.3 part of dispersing suspending agent, 0.1-1 part of defoaming agent and 20-40 parts of water; The modified slag is of a core-shell structure and sequentially comprises a slag inner core, a calcium salt component loaded on the surface or in pores of the slag inner core, a humate layer formed by surface loading, and a quaternary ammonium salt type cationic polymer layer coated on the outer side of the humate layer. According to the application, by designing the modified slag with the interface regulation function, the interaction relation between the cement phase and the emulsion phase at a microscopic interface is regulated under the condition of higher styrene-acrylic emulsion dosage, so that two curing m